Rotatable Microphone Mount for Stereo Angle Adjustment
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Solution Overview
Problem
Existing microphone units for stereophonic recording face challenges in adjusting the intersecting angle of sound collecting axes without compromising directivity and sound quality, often requiring complex structures that increase weight, size, and susceptibility to obstacles, leading to degraded performance.
Innovation Solution
A microphone unit design where a pair of unidirectional microphones are mounted on rotation bases with distinct rotation axes, allowing for adjustable intersecting angles within a practical range without altering the distance between microphones, using a simple and compact mechanism to maintain optimal sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex structure with gears and pinions is used to adjust the intersecting angle, then the adjustability is improved, but the device complexity and weight increase
Solution Approach 1:
The patent employs a rotatable base that allows dynamic adjustment of the microphone's orientation. The base can rotate to change the intersecting angle between sound collecting axes, providing adaptability without complex mechanisms. This dynamic structure enables continuous angle adjustment while maintaining simplicity.
Solution Approach 2:
The microphone assembly is segmented into distinct components: the microphone element, the rotatable base, and the mounting structure. This segmentation allows independent optimization of each component and simplifies the overall structure by eliminating the need for interconnected gears and pinions.
2Strength
If strong and big components are used to retain strength, then the structural strength is improved, but the area of rear opening decreases and directivity degrades
Solution Approach 1:
The patent uses a lightweight rotatable base with sufficient structural integrity, eliminating the need for bulky strong components. The base structure is designed to provide necessary strength while maintaining a compact form that does not obstruct the rear opening area, thus preserving microphone directivity.
3Adaptability or versatility
If a large scale structure with semicircular rail is used for moving bases, then the adjustability range is improved, but the device complexity and weight increase
Solution Approach 1:
Instead of a fixed semicircular rail structure, the patent implements a rotatable base that can dynamically adjust to any angle within the desired range. This dynamic approach provides the same adjustability as a large-scale rail system but with significantly reduced complexity and weight.
4Ease of operation
If the moving bases are freely moved within a certain range, then the ease of operation is improved, but the positioning precision and reliability decrease
Solution Approach 1:
The rotatable base incorporates positioning mechanisms that provide feedback for accurate angle setting. This ensures that when the base is freely adjusted, it can be precisely positioned at the desired intersecting angle, maintaining both ease of operation and positioning reliability.
Data Source
AI summary
To provide a microphone unit for stereophonic recording capable of adjusting an intersecting angle of sound collecting axes in accordance with conditions without impairing directivity and sound quality of the microphone. Respective rotation bases (408, 508) are rotatable about a center axis with respect to mounting bases (404, 504), respectively, which are mounted to a main body (20) of a portable sound recorder (10) through respective brackets (402, 502). Respective top ends of respective knurls (414, 514) of leading ends of the respective rotation bases (408, 508) has a shape being cut to form an inclined surface from a radial direction, and respective microphones (418, 518) are retained so that diaphragms (420, 520) are in consonance with the cut surface. Accordingly, by rotation of the respective rotation bases (408, 508), sound collecting axes (426, 526) vertically extending from the diaphragms (420, 520) are changed in their axes like a precession, thereby being capable of adjusting an intersecting angle of the sound collecting axes (426, 526) of right and left microphones (418, 518).